Drill.



HOLLAND.

DRILL.

APPLlCATlON HLED JUNE 29,1917.

i fiwwzo Patented May 14, 1918.

pnrrnn snares reruns enrich.

WALTER J. HC'LLAND, OF BERKELEY, CA -TFOPINIA.

DRILL.

Application filed June 29, 1917. Serial No. 177,712.

To all whom it may concern:

Be it known that I, WALTER J. HOLLAND, a citizen of the United States, and resident of Berkeley, in the county of Alameda and State of California, have invented certain new and useful Improvements in Drills, of which the following is a specification.

This invention relates to drills, and it is the primary object of the invention to pro vide a rotatable disk drill, the disks of which are so positioned as to eliminate the forming of cores in the bore, thus, allowing water, which is used as a conveying medium to thoroughly remove the disintegrated portions of stone and preventing choking of the bore.

It is also an object of the invention to provide a novel mounting for the cutting disks, whereby, wear, caused by the rotation of disks, on the pins, and on the legs of the bit will be prevented.

Other and further improvements and novel details in the construction and an rangement of parts will be appreciated from the description to follow, which, for a clear understanding of the invention should he considered in connection with the accompanying drawings forming a part hereof and wherein the preferred embodiment of the invention is shown for the purposes illustration,

In the drawings: Figure l is a bottom plan of the improved drill with one of the cutting disks and its mounting shown in section; and

hi 2 is a side elevation of the same. Re erring now more specifically to the drawings and in connection with which like reference numerals will designate corresponding parts throughout the several views, there is provided a head 1 having a screw threaded nipple 2 formed upon its upper portion anda plurality of spaced legs 3 upon its lower portion, the said legs be ing disposed parallel to each other and odset whereby suficient clearance will be al lowed the cutting disk as carried thereby, which will be hereinafter more fully described. A' plurality of diverging water ducts 4 are formed within the head 1 and its nipple 2 and are adapted to be connected with a suitable supply tube turned into engagement with the screw threaded portion of the said nipple, whereby water may be in rt in "2d into the borer for removing par- Specification of Letters latent.

Patented May 14%, Edias at 6 in order that locking nuts 7 may be turned into engagement therewith. Obviously, portions of the screws 5 project beyond their respective legs 3 and provide efiieient bearing means for the cutting disks.

Disks 8 concave on the cutting face and straight sloped the back are loosely mounted upon the he g portions of the screws and have seen.

in to their opposite sides bearin washerd which washers may be and preterahly are formed of a metal softer than. that irohn, which the cutting disks 8 are formed A plurality of openingn are formed wi hin the various bearing wudhers 9, c ash: r hich are counter-sunk and receive t ere i" :ough connecting screws 10, the screws passing through similar openings as formed in the adjacent portions of the cutting disks and serving as means for securely uniting the same and their respective hearing washers It is to he noted, that the bearing washers 9 are of a diameter less the bearing openings as formed in the cutting dish 8 and a consequence, will have entire wear created by the rotation of the disk directed thereon. Upon loosening of the disks with relation to their respective bearing washers, the screw 10 may he tightened in order that the wear may he taken up while the locking nut 7 as en ,a l with the reduced portion 6 may o tightened to move the screws 5 accordingly. The concave faced cutting disks 8 are arranged in longitudinal alinement and have portions of their sloped surfaces overlapping and arranged adjacent each other, thus, eliminating all space therebetween and preventing the forming of cores within the bore during the drilling operation.

Obviously, the adjacent sloping portions of the cutting disks 8 may have their relative positions varied to increase or decrease the space therebetween such as conditions or preference may dictate.

lldanifestly, the construction shown is capable of considerable modification and such modification as is within the scope of my 2 mo es.

claims, I consider Within the spirit of my having concaved cutting faces and sloped invention. backs mounted loosely on said hearing I claim means, portions of-the surfaces of the disks 1. A drill, including a head having spaced overlapping and lying adjacent each other, legs thereon, and disks having sloping backs and Wear compensating Washers secured to carried by said legs, portions of the sloping the opposite sides of the disks and engaged surfaces of the disks overlapping and arwith the bearing means. ranged adjacent each other. l. A drill, including a head having spaced 2. A drill, including a head having spaced legsthereon, and disks having concaved cutlegs thereon, and disks having sloping backs ting faces and sloped backs carried by said arranged on said legs in longitudinal alinelegs, portions of the sloping backs of the ment, portions of the sloping surfaces of he disks overlapping and arranged adjacent disks overlapping and lying adjacent each each other.

other. In testimony whereof I afiix my signature 3. A drill, including a head having spaced hereto. legsthereon, adjustable bearing means carried by said legs, longitudinally'alined disks WALTER J. HOLLAND. 

